What is the best description of accuracy in the context of bone densitometry?

• A. The ability to measure only average values
• B. The consistency of repeated measurements
• C. The ability to measure true value
• D. The ability to compare two different technologies

Answer: (C)

Accuracy in the context of bone densitometry refers to the ability of a measurement to represent the true value of bone density. In other words, when a bone densitometer is described as accurate, it means that its readings closely match the actual bone mineral density of the patient being tested. Accurate measurements are crucial in clinical settings because they directly influence diagnosis and treatment decisions for conditions such as osteoporosis.

In contrast, the other options have different meanings. Measuring only average values does not capture the importance of true values, as it may not reflect individual patient scenarios accurately. Consistency of repeated measurements pertains more to the concept of precision, which focuses on the reproducibility of results rather than their correctness. Comparing two different technologies for measuring bone density does not inherently address how close those measurements are to the true values; it simply involves evaluating their performance against one another. Thus, the primary focus on accuracy defines its essential role in providing reliable and clinically relevant bone density assessments.